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Data Communication & networking

This blog is for undergraduate/graduate students who require some basic information about their subjects or any other topic related to data communication.

Monday, 28 March 2011

WAN (Wide Area Network)

WAN (WIDE AREA NETWORK):

Wide Area Network is a computer network that covers a broad area i.e. any network whose communications links cross metropolitan, regional or national boundaries.

For transmission of data beyond local area communication is typically achieved throught a network of intermediate switching nodes. The purpose of switching nodes is to provide a switching facility that will move the data from node to node until it reaches to its destination. Network Services Available For MAN & WAN:1- Dialed Circuit Services: There services includes direct dialing and wide area telephone services.2- DedicatedCircuit Services: It includes voice-grade circuits wideband analog services, T-carrier circuits & synchronous Optical Network (SONET).3- Circuit Switched Services: it includes Integrated Service Digital Network (ISDN).4- PacketSwitched Services: It includes X.25, Frame Relay, ATM, SMDS and Ethernet-IP.TYPES OF WAN:Following technologies are used in wide area switched networks,(1) Circuit Switching (2) Packet Switching (3) Message Switching.